Method for manufacturing SPA-H high-strength atmospheric corrosion resistance steel by using continuous annealing machine set

Abstract

The invention provides a method for manufacturing SPA-H high-strength atmospheric corrosion resistance steel by using a continuous annealing machine set, belonging to the field of rolling of cold rolled strips. Parameters of a hot rolling process are as follows: the heating temperature is 1180-1260 DEG C, the final rolling temperature is 860+ / -20 DEG C, the rolling temperature is 610+ / -20 DEG C, and the cold rolling screwdown rate is controlled within a range of 35-60% according to different specifications. The temperature of a continuous annealing heating section is 800+ / -20 DEG C, the temperature of a soaking section is 800+ / -20 DEG C, the temperature of a slow cooling section outlet is 680+ / -20 DEG C, the temperature of a quick cooling section outlet is 430+ / -20 DEG C, the temperature of an overageing section is 400+ / -20 DEG C, the process speed is 150-200 mpm, the soaking time is 200-250 s, and the leveling elongation is 1.2+ / -0.3 %. The method provided by the invention has the following advantages that: the SPA-H high-strength atmospheric corrosion resistance steel generally manufactured on a hot rolling production line in the prior art is successfully manufactured on the continuous annealing machine set by using the cold rolling process while the hot rolling production machine set is affected by factors like limit specifications and mechanical equipment capacities and the like; and the cold rolling process, continuous annealing process and other processes are optimized in such a way that the manufactured high-strength atmospheric corrosion resistance steel has high strength and good elongation.

Description

technical field [0001] The invention belongs to the technical field of cold-rolled strip rolling, in particular to a method for producing SPA-H high-strength weather-resistant steel by using a continuous annealing unit. Background technique [0002] SPA-H high-strength weathering steel is mainly used in the field of container manufacturing, and is often produced by hot rolling process. With the smooth commissioning of hot rolling of Shougang Qiangang and the continuous advancement of product development, at the end of 2008, Shougang Qiangang successfully developed high-strength, high-weather-resistant SPA-H container steel, and soon won a large container customer in Tianjin. bulk orders. Among the large orders placed by customers, there are not only common specification products that are easy to produce, but also some extreme specification orders with a thickness of 1.5-1.6mm and a width of 940-1400mm. The unit, according to the requirements of the hot rolling process, if ...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a method for producing SPA-H high-strength weather-resistant steel by using a continuous annealing unit. When producing SPA-H high-strength weather-resistant steel with a thickness of 1.5-1.6mm and a width of 940-1400mm, it solves the problem that the 2160 unit cannot produce extremely high-strength weather-resistant steel. Thin and extremely narrow weathering steel issues

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